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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The dam has been repaired and modified several times over the years. <br />Significant oodifications were performed in 1966 when both outlet works were <br />extended upstrea~, a slurry cutoff trench constructed at the upstream toe, an <br />impervious blanket placed on the upstrea~ face, and a stability berm built at <br />the downstream toe. In 1982, riprap was repaired and extended towards the <br />right abutment, and in 1985 an upstream portion of the Main outlet conduit was <br />lined with steel. <br /> <br />2.2.2 Crest <br /> <br />The crest of the dar.1 is nominally 20 feet wide although the edges have been <br />eroded resulti ng in an effecti ve wi dth of about 16 feet. The service road <br />that runs along its length is well maintained with only minor vehicle rutting <br />and irregularities in elevation. The one foot difference in elevation of the <br />da~ crest beyond station 13+20, which the drawings show to be an auxiliary <br />spillway at elevation 9394, is not readily apparent. A widening of the dar.1 <br />crest to about 25 feet occurs at the Main outlet works wet well. <br /> <br />2.2.3 Upstream Face <br /> <br />The upstrear.1 face of the da~ is generally in good condi ti on. Fro~ stati on <br />2+00 to 8+00 the slope varies but is generally 2.6H to lV above elevation <br />9385.5 (G.H. 30.5), and 3.2H to lV below that elevation. The face is covered <br />with uniform, angul ar ri prap wi th an average di a~eter of 18 to 24 inches. <br />Minor slumps and depressions can be noted in the riprap but generally it is in <br />good condition. Fro~ station 8+00 to 13+80 hard angular riprap of a size <br />ranging fro~ 24 to 36 inches has been added to the face of the dam, during the <br />repairs of 1982. From station 13+80 to 17+20, at the spillway near the right <br />abutment, the upstrea~ face is ~uch steeper at approximately 1.6H to lV and <br />riprap protection is inadequate. This includes the section of the dam where <br />the crest has been lowered one foot. Apparently, riprap was not placed along <br />this stretch of the da~ as it was intended to breach in the event of <br /> <br />2084H <br /> <br />-3- <br />